it is not a stuck round but a stuck empty brass. The slide comes back fine and tries to feed the new round but the empty brass is still in the chamber. If I lock the slide back and remove the mag and the new round it was trying to feed, I can see the empty brass in the chamber. If i let the slide go home to try and eject the empty, the slide (extractor) must lock onto the empty and I can't pull the slide back, so i use a dowel rod down the barrel and push the empty out, as the slide also goes back. The brass seems bulged at the bottom so it is tight in the chamber. Since I case gauge everything I am at a loss on what is happening. PF is 128 147 xtreme plated oal is 1.130-1.135. Over 5k+ rounds with this combo. no problems til now. As I said 2 in the last 200+ rounds. Gun shoots fine. Maybe I somehow missed case gauging some ammo, however, I can't remember a loaded round not passing the case gauge test anyhow.